It's leaking. It's a old water drain pipe coming from kitchen sink

You have a clog in the drain somewhere after these two join the main drain pipe.

most likely that it is a old drain pipe as some plumbers used copper for that purpose. if it is a drain all u have to do is cap it. if it turns out to be a vent pipe u can install a end of the line vent cap. I cant remember what it is called but your supply store will know. just tell them u want to install a vent under the sink not through the roof.

Use hydrogen peroxide and/ white vinegar to safely deodorize disposal.
Clean out drain line under sink, and bottom of disposal under cutter blade.
Copy following link for clogged disposal, and drain line tips.
http://waterheatertimer.org/How-to-repair-and-install-Garbage-disposal.html

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Find out exactly where leak is coming from.
You say water is coming from the side... is that where the pipe connects? Then take apart pipe and reassemble pipe using instructions below, and use rectorseal on joints as described below..
Is water coming from where dishwasher connects to disposal? Then tighten the clamp.
Is water coming from top where disposal connects to sink? Run paper towel around top to check for moisture, and then use steps below to dissemble disposal and re-install same disposal.
Is water coming from a rusted hole in disposal. Then replace disposal using steps below:

Here are the disposal steps:
When I worked apartment maintenance, we replaced disposal with same brand disposal.
That way we didn't have to change out sink basket or change pipes.
How to: Disconnect p-trap and tailpiece going into disposal.
Rotate connector disk clockwise that holds disposal to sink basket.
Before installing new disposal.
Attach electric wire to new disposal.
Attach dishwasher tube to new disposal. Knock out plug inside dishwasher opening.
Push new disposal up into place, and attach to old sink basket with new connector disk.
Use new connector washer.
Re-assemble tubular pipe.



If this is your home, you want new sink basket that comes with new disposal because it looks shiny and new.
Buy a tub of plumbers putty also.
Remove old sink basket and clean opening.
Put finger-size roll of plumbers putty around sink opening, and then push new strainer basket into plumbers putty.
Tighten basket from below, wipe away excess putty around sink opening.
Install new disposal as described above.



Tips for tubular pipes:
When taking apart tubular pipes, start at p-trap and take apart as few pieces as needed to do job.
On image below, loosen both upper and lower nuts, trap falls loose, and then work on disposal.
Any tubular drain pipe that gets moved while working under sink needs to be disassembled, cleaned and re-assembled.
Metal pipes have rubber washer >> always use new rubber washers.
Plastic pipes have plastic washers > plastic washers can be cleaned and re-used.
Plastic washers have flat side that goes toward nut, tapered side away from nut.



When reassembling tubular pipe, we use rectorseal on washers and joints.
Apply good amount on washer just before pushing washer in place and attaching nut.
Rectorseal will ensure tubular drain pipes won't leak.

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The leak comes from above where water comes out.

Turn off power before touching wet electrical appliance.

Put stopper in disposal.
Fill sink with water.
Check if water is getting through the putty seal at sink connection.

Next, check if water leaks only when dishwasher runs. Dishwasher drains into garbage disposal.

Last, check tailpiece where it attaches to side of garbage disposal. The tailpiece is usually sealed with a rubber washer. When washer is old, it gets deformed, and then it doesn't seal perfectly when put back.

I use rectorseal on all tubular pipe joints under the sink.
Works on both plastic and rubber washers.
It is gooey and sticky.
Brush it all over the washer, use plenty, then assemble pipes.
The rectorseal assures that joint will not leak.

open to drain pipes. remove the collars that hold trap on, sometimes you may need pliers or a pipe wrench to remove.install is reverse of removal the trap is there to contain the gases in drain pipe. if no trap. you will smell sewer water all the time. 1-1/4 for bathroom drains and 1-1/2 for kitchen sink drain.

sounds like you have a partial blockage in wall pipe.take of p trap and snake pipe in wall as far as you can.